Points to remember when using the start/stop function
For the start/stop function to work requires that a number of conditions are met.
The start/stop function is not activated
One or more criteria may mean that the engine is not switched off/the function is not activated.
- the driver has not fastened the seatbelt
- the car has not been able to reach a speed of approx. 10 km/h (6 mph) after starting or the function has been activated a number of times successively
- the engine has not reached normal operating temperature
- the windscreen’s electric heating is activated
- the environment in the passenger compartment deviates from the set values
- the driver is making large steering wheel movements
- the road is very steep
- the bonnet is opened
- the ABS system has been activated
- in the event of heavy braking (even without the ABS system having been activated)
- the capacity of the starter battery has fallen below the minimum permissible level
- many starts during a short period of time have activated the starter motor’s thermal protection
- the exhaust system’s particulate filter is full
- a trailer is connected to the car’s electrical system.
High current take-off may lead to a low battery level, which temporarily limits the start/stop function. The engine then starts automatically without the driver lifting his/her foot from the brake pedal.
The start/stop function is not deactivated
One or more criteria may mean that the engine is not started/the function is not deactivated.
- the driver has not fastened the seatbelt
- gear position P is engaged and the driver door is open.
The start/stop function is deactivated without the brake pedal being released
In the following cases, the function may be deactivated and the engine started without the driver releasing the brake pedal:
- high humidity in the passenger compartment forms misting on the windows
- the environment in the passenger compartment deviates from the set values
- repeated pumping of the brake pedal
- the bonnet is opened
- the capacity of the starter battery has fallen below the minimum permissible level
- the driver’s seatbelt is unbuckled and the gear selector is in position D or N
- the gear selector is moved from position D to position R or M
- the driver door is opened with the gear selector in position D.
Do not open the bonnet when the start/stop function is active. Switch off the engine normally before raising the bonnet.
Activating and deactivating the start/stop function
Activating the start/stop function
Depress and hold the brake pedal depressed.
The start/stop function is activated and the engine is switched off.
Note
- In Comfort or Eco drive mode, the start/stop function is activated before the car is completely stationary.
- When adaptive cruise control or Pilot Assist is activated, the start/stop function is activated for a few seconds after the car is completely stationary.
Note
All of the car’s normal systems, such as lighting and radio, work normally even when the start/stop function is activated.
However, some equipment may have temporarily reduced function, such as the climate control’s fan speed or loudspeaker volume.
Deactivating the start/stop function
Release the brake pedal or gently depress the accelerator pedal.
The start/stop function is deactivated and the engine starts.
Note
When the start/stop function is deactivated and:
- the function for automatic braking when stationary (Auto hold) is activated, the start of the engine is delayed until the accelerator pedal is depressed
- adaptive cruise control or Pilot Assist is activated, the engine starts when the accelerator pedal is depressed or by pressing the button on the left-hand steering wheel keypad
- the car is facing uphill, hill start assists (HSA) engages to prevent the car from rolling backwards
- the car is facing downhill, release the brake pedal slightly. A small increase in speed starts the engine.
Settings in the centre display
The centre display shows whether the function is available or deactivated.
Illuminated indication: the start/stop function is available.
Extinguished indication: the start/stop function is deactivated.
Symbols in the driver display
The driver display’s tachometer indicates when the start/stop function is available, active or unavailable.
| Symbol | Specification |
|---|---|
| White – the function is available. | |
| Green – the function is activated. | |
| Grey – the function is not available. |
If no symbol is shown in the driver display, the function is disabled.